Clamping mechanism



Feb. 14,1928. 1,659,074

F. c. BECKER CLAMPING MECHANISM Filed Feb. 1923 Patented Feb.

" UNITED fsTA NETTE, rnNNsYLvANIA, ASSIGNOR ro..wns'rnonnLANn' rnnn c.BECKER, or JEAN l r GBAPEVILLE, PENNSYLVANIA, n CORPORATION on i IS1?ECIALTY COMPANY, O *IENNSYLVANIA.

for holding the Application filed February art of grinding glassarticles, I

particularly to the construction of the chuck 7 article tobe ground.

e construction -shown portion of the clamp ng arm invention is-animprovement in the and relates It is the gripp ng end which comes 3directly into holding engagement with the blank.

In the drawin Fig 1 l is a vertical sectional view' showing the clampingin closed position;

Fig. 2 is a part the clamping Fig. 3 1s a dot mechanism showing .thegripping end of arm;

Fig. t 1

posed of a h ring or cylinder tegral middle web portion tral portion ofwhich is openor clearance of the unit. It is also and a rubber diproviding a for the inwar of the knob.

Cylinder 13 is ra 13 having a inner V centrally aper sk 16 is'inserresilient or cush dly extending middle ial similar view, showingmechanism opened;

all view in persp for the blank,

ective, the clamping view in sectional elevame in further detail;

tive detail view of one detached.

the unit is comthe lower cented as shown, ioned bearing dially slottedat four equi-distant locations, asindicated at 17, and

a series 0 ally mounted ortions 2O ada f four clamping arms at 19 insuch purpose of providing opening and closing the arm terminals.

arms 18 are provided pted to embrace the 18 are pivotslots, for the Theouter with grip annular edges of the knob a when tightened thereon,depending on the strength of spring 31, as in Fig.

1. The inner faces of the gripping terminals 20 are abruptly inclined soas to embrace the ware a and t the cushioning backwardly aga Theresiliency o pensate for inequa thus cooperates W1 and f the cushion ofthe gripping terminals.

The outer portions 0 together for suc h tightening,

wedge it disk 16. tends to comlities in the ware un ts,- th the wedgingaction f the arms are brought or opened for through slot 3 s'ocketed forcrown portion of the tured as at 15,

portion oLAnrING MECHANISM. 1 3

2a, 1923. Serial No. 621,883.

the action of toggle release, as in "Fig. 2, by

1 8 and" at their inner upperends of arms arms 21; The latterare pivotedat 22 to the ends, at 23, tolateial lugs on'the inner end i by rivetingat 1 end of terminal 28 and a washer-32 shoul dered in tube 25, thespring tending tonormally thrust stem 27 outwardlyto holdthe clampingarms in operative engagement with the unit a,

sure of stem 27 against thrust ring 2 L inw upper ends of arms throwingthe clamp ardly and 18 inwardly by links 21, ing terminals outwardly forrelease or insertion of the unit, as in Fig. 2. L l a i I have found inpractice that with gr1p ping arms of ordinary steel or other hard.metal, there is-a tendency to scratch or mar the surface of the glassunit, and the present improvement isdesigned to overcome any suchaction, while at the same time iinproving the hold on the unit. i

For such purpose, the. inner active face of the gripping end portions,are covered with an applied shoe or facing'33, which in turn ispreferably covered with a coating or as in Fig. 1. Inward presthe springacts to a to draw the Y.

film 34:, adapted to make direct contact against the glass unit a. Theshoe 33 is of a comparatively soft metal, as copper, and its grippingface is covered with a still softer material, as lead, over the shoe,and renewed from time to time, as it wears down;

l The shoe is bent tofit around the hooked terminal 20, doubled over itstop and extend ed partway underneath, as at 35, the upper end beingtightly inserted in a cross slot 36,

extending partway back into the shank of the terminal arm, as shown.

In this manner, the shoe may be very firmly attached to the armterminal, and its solder, or the like, laid outer facing coat 34 assistsin the protecting I with the and holding action by slightly lapping overonto the'shank, as at 3:. When Worn, the shoe may be driven out throughthe slot and off of the ternnnah'when a new shoe 'may be applied, Withitsv supplemental coat- 1n'g,as Will beneadily understood.

The construction and operation of the 1n vention will be readilyunderstood from the ner in'urin or affectin the surfaces.

In certain cases, if desired, the coating lihn 3 1 may be omitted, inwhich case the shoe,

oi." copper or other suitable soft metal,

\i'ill grip directly against the glass unit.

The improvement is very simple, cheap,

and etiicient, and has the added advantage of preventing any Wearwhatever on the nietaltace of the jaw itself.

What I claim is:

In a ware holding clamp, the combination of a body portion having anendmost Ware receiving socket, an inner resilient bearing disk in saidsocket, a central stem, and a soring retracted plunger rod connectedWith a head slidably mounted pluralityof gripping arms pivoted to theouter body portion having link connection with said head andeachprevided with an inwardly extending Ware gripping terminal shoehaving a sloping face provided with a covering plate in slottedconnection With the shoe and in clamping engagement with its terminaledge, and adapted to engage the sloping faces of a blank and to effectWedging movement thereot against the bearing disk. V

In testimony whereof I hereunto afiix my signature.

' FRED C. BECKER.

on the stem, of a-

